by She swam strongly and …… cross the river easily, even though it was swollen by the heavy rain.
A. used to
B. was able to
C. could
D. was supposed to
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Đáp án: B
Giải thích: Cô bơi mạnh mẽ và có thể qua sông dễ dàng, mặc dù nó bị sưng do mưa lớn.
